Rimless optical lens.



W. W. BRILHART.

RIMLESS OPTICAL LENS,

Awucmou FILED MAR. 21. mm.

1 ,27 3,573. Patented Jul 23, 1918.

1 VI 'EN TOR:

Specification of Letters Patent.

Patented July as, 1918;

Application flied March 21, 1917. Serial No. 158,894.

To all whom it may concern:

e it known that I, WILLIAM Wournnvo- TON BRILHART, a citizen of the United States, residing in the city and county of o-Indiana, State of ennsylvania, have invented and useful Improvements in Rimless Optical Lenses, of which g 18 a specification. y invention relates to lenses employed in spectacles, eyeglasses and other optical instruments of that class, in which one or two pieces of flint or is composed of more brittle two res ective ends where it is fasten t e lens, when completed, metal spectacle or e eglass mountings, and has for its object t e increase of rigidity and durableness of rimless optical lenses.

, Lenses of this construction are employed in spectacles and e eglasses with the one obi'ect to lessen the requent breakage of rimess lenses and is valued most when applied t of lenses.

my invention conglass, near its expected to o the more costly forms Generically considered, 'sists of a lens formed of a single inte a1 piece of glass having a plurality of regions therein, of different or dissimi ar rigidity, and my invention also comprehends or consists in the process or method by means of which such a' lens is produced.

In the manufacture of m lens, I may take a piece of glass having suitable dimensions, the said glass being composed of ordinary lens material, such as crown glass, bevel and polish two ends thereof, and then take two pieces ofhm'der material, such as'flint glass, bevel and olis'h one surface of each so that 40 they will fit on' the said beveled ends of the main piece, and place them respectively thereon and subject the whole to a tempera- Attire of heat suiiicient to occasion coalescence of the three pieces of glass; that is, sub ect 46 the same to a temperature suflicient the three pieces of glass to fuse bogether to form a" single, integral, homogeneous plate of lass.

t will'be understood that the lenses may be ground to any desired curvature or form, thesame as is usual in themanufacture of spectacle, eyeglass and other optical lenses. eferrin to the drawings forming apart ofthis -specification: Eigure I is a plan view of a plate of crown k glass with two smaller pieces of harder glass toasetof.

point suflicient fitted onto the two beveled ends thereof and fused thereto. i

Fig. II is a side View of Fig. I. 1 Fig. III is'a face view of an optical lens as ground and finished from the plate of glass illustrated in Figs. I and II, in detail the-two end of crown en s.

Fig. IV is a side view of Fig. III. V is also a side view of Fig. applied to a deepdmeniscus or: toric form of an lens blank which is illustrated in Figs. I and II. I

In Figs. I to II of the drawings, 1 desig-I nates a main slab of crown glass; 2, beveled main slab, and 3, small slabs of glass as fused to the main slab 1.

igs. III to V of the drawf' s, 1 desthemain n lgnates lens; 2, the lines of conjunction or connec tion between the, portions of glass of differ ent rigidity; 3, small slabs of hard glass which are fused to the main slab 1; and 4, holes drilled through the glass lens near its two ends.

It will be understood that the ends of the main slab of glass, of which the lens or lens blank is composed, are beveled or shaped and polished while cold; that the may be shaped to fit on the said beveled .ends slab of glass or smaller pieces be further understood that the glass may be assembled and to a heating process, for

It will three pieces of the whole subjected the purpose of raising the temperature to a,

to occasion the fus ng or welding of the three pieces of glass together, to form a single integral PIGCGIOI glass which may be ground to any curvature or form desired, as, for instance, Jspherical, as is illustrated in Figs. III and 6e meniscus and toric, as in Fig. V; that any suitable furnace or other means may be employed for subjecting the glass to heat to raise the same to a temperature necessary to occasion a coalescence or weldin of the separate pieces of glass'in t a process manufacturing 0 tical lenses or lens blanks as is embodie in this my invention. In the constructions" illustrated in the they may he applied thereto while in a molten state.

together the same slab 

